Elevator



SePt- 10, 1940 c. s. LAGERQUIST ET AL 2,214,588

I ELEVATOR Filed April 24, 1939 2 Sheets-Sheet l Sept. 10, 1940.

c. s. LAGERQUIST ET AL 2 Sheets-Sheet 2 Patented Sept. 10, 1940 UNITED STATE ELE-VATOR Carl S. Lagerquist, Hopkins, and Frank W. Lagerquist, Wayzata, Minn.

Application April 24, 1939, Serial No. 269,684

4 Claims.

Our inventionv relates to elevators and more particularly to a iiuid actuated elevator.

It is well known that hydraulic elevators are now actuated by a central piston on the upper end of which the car of the elevator rests. 'I'his piston w'orks in a casing set in the ground entirely below the travel of the elevator car. Drilling a hole for such a casing is an expensive operation and often considerable diflculty is encountered due to quicksand, niggerheads, and other unforseen obstructions.

The principal object of this invention is to provide a pair of upright casings that are substantially entirely above the ground or lower floor together with a carrier or car platform that is held suspended from and between the pistons in the casings for travel between said casings.

A further object of the invention is to attach guide rails for the carrier to the casings and also provide said casings with means for securing the same to walls or other relatively fixed supports.

A still further object of the invention is to provide an elevator structure on which substantially all of the work thereon may be performed in the shop and the parts thereof shipped in assembled units that can be very quickly installed under proper supervision by local Workmen, thus eliminating the necessity of sending expert workmen from the shop.

A still further object of the invention is to provide novel means of suspending a carrier from a pair of pistons to prevent lateral strains on the pistons due to the unequal distribution of a load on the carrier, that would cause said pistons to bind in their stufiing boxes and thereby produce undue friction and wear. This increased friction on the pistons would of course require increased fluid pressure to operate the same and if the binding action on one of the pistons was greater than on the other it w'ould cause the same to lag with the result that the pistons would not travel at the same speed.

Other objects of the invention will be apparent from the following description, reference being had to the accompanying drawings.

To the above end, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a View partly in plan and partly in section on the line I-I of Fig. 2, with some parts broken away; f

Fig. 2 is a fragmentary view in front elevation; Fig. 3 is a plan View of the parts shown in Fig. 7 is a fragmentary detail view in section taken on the line 'I-'I of Fig. l; and

Fig. 8 is a fragmentary detail view vpartly in IIS elevation and partly in section taken `on the line 8 8 of Fig. 1.

The improved elevator' is shown installed in a well 9 in a building and operates between the rst and second oors thereof, said floors being 2bdesignated by the numerals I0 and il, respecn tively. At the bottom of the Well 9 and below the rst floor is a relatively shallow pit I2. It may be here stated that the rst floor, heretofore referred to, may be in a basement at the 25 ground level or at any other elevation from which the elevator starts.

Referring now in detail to the elevator, illus- .trated in the drawings, the numeral I3 indicates x a pair of upright parallel casings or cylinders 3o rigidly secured, one to each of the side walls oi the well 9 by a plurality of vertically spaced brackets I4.

'I'hese brackets I4 ar'e rigidly secured to the casings I3 by welding or otherwise and in turn 35v4 are secured to the side walls of the well 9 by bolts or lag screws I 5. f

'Ihe lower end of each casing I3 is closed by a plug I6 and on the upper end of said casing is a stuiling box I'I. The casings I3 at their lower 4.0

end portions are extended slightly below the pit I2 in order to securea proper footing therefor and the casings I3 at their upper ends terminate considerably below the second floor Il.

Working in each casing I3 through its stuiiing 45 box I'I, is a cylindrical piston I8 having considerable clearance with the internal walls of said casing. The lower end of each piston i8 is closed by a plug I9. A cross-head 20 in the form of an I-beam, extends, at its end portions, over the Fl)V angle bars 24 and a pair of downwardly and outwardly diverging brace bars 25.

The cross-head 2D and platform structure 22 are held for straight line travel by T-guide rails 26 and upper and lower shoes 2'I slidably mounted thereon. The guide rails 26 are secured to the brackets I4 by clamps 28 and the upper shoes 21 are secured to the cross-head 2|), and the lower shoes 21 `are secured to the platform structure 22.

The pistons I8 are raised or lowered by oil X, or water or any other suitable fluid from a supply tank 29 supported in a raised position by legs 30. Oil X is supplied under pressure to the casings I3 by a pump 3| driven fr'om an electric motor 32 by a multiple belt drive 33. An oil supply pipe 34 leads from the tank 29 at the bottom thereof to the intake side of the pump 3I and a pipe 35 leads from the discharge side of said pump to an equalizing chamber in a shell 36. Each casing I 3 is connected by a branch pipe 31 to the equalizing chamber in the shell 36.

A check valve 38 is interposed inthe pipe 35 and arranged to open, in the direction of the arrow at the side thereof, and permit a flow of oil from the pump 3l to the casings I3 and thereby raise the pistons I8 and hence the car platform structure 22. An oil return pipev 39 leads from the pipe 35 between the pump 3I and the equalizing chamber in the shell 36 to the oil supply tank 29. Interposed in the pipe 39 is a magnetic valve 48 arranged to open, in the direction of the arrow at the side thereof, see Fig. 1. During the operation'of the pump 3| to force oil into the casings I3 and thereby raise the pistons I8, the check valve 38 is open and the magnetic valve 48 is closed.

As the electric controls for the motor 32 and the magnetic valve 48 will be standard equipment, it is not thought necessary to illustrate the same except sections of the electric wire 4I attached to said valve. To lower the car platform structure 22 the magnetic valve IIE is opened and oil in the casings I3 displaced by the downwardly moving pistons I8 is forced into the supply tank 29 through the branch pipes 3l, shell 36 and pipe 39 to the check valve 38 which is held closed by pressure of the return oil, and from thence said oil is forced through the pipe 39 and magnetic valve 4I] to the tank 29.

The ball and socket joints 2I permit angular movement of the cross-head 29 and hence the car platform structure 22 relative to the pistons I8 in case the load on said structure is not substantially evenly distributed on said structure and thus prevent lateral strains on the pistons I8 that would tend to cause the same to bind in the stuffing boxes I'I. The guide rails 26 above the casings I3 are secured by brackets 42 to the sides of the well 9.

From the above description it is evident that the major portions of the casings I3 are entirely above the lower most position of the car platform structure 22. This novel arrangement of the casings I3 lends itself to a relatively inexpensive installation for the reason that no drilling is required and very little digging necessary to form a relatively shallow pit below the car platform structure 22 and the necessary footings for the casings I3.

It is also evident that each casing I3, its brackets I4, its piston I8 and the respective guide rail 26 and all minor parts associated therewith form a single unit on which substantially all of the with the travel of the pistons I8 at the shop so that accurate alignment and spacing of the casings I3, at the time of installation, will automatically align and correctly space the guide rails 26.

It will be understood that the invention described is capable of various modications within the scope of the invention herein disclosed and claimed.

What we claim is:

1. The combination with a structure having a lower floor, an upper oor and a shaft extending between said iioors and through the upper floor, of a pair of laterally spaced upright casings in the shaft between said oors and rigidly secured relative to the structure, a piston in each casing, a cross-head mounted on the upper .ends-of the pistons above the casings, a platform, slings suspending the platform from the cross-head between the pistons for travel between the casings and above the same, and means for simultaneously operating the pistons to either raise or lower the platform from one floor to the other.

2. The combination with a structure having a lower floor, an upper oor, and a shaft extending between said floors and through the upper floor, of a pair of laterally spaced upright casings in the shaft between said floors and rigidly secured relative to the structure, a piston in each casing, a cross-head mounted on the upper ends of the pistons above the casings, a platform, slings suspending the' platform from the cross-head between the pistons for travel between the casings and above the same, a pair of guides extending parallel to the axes of the casings and the pistonsY and rigidly secured relative to the casings, shoes carried by the cross-head and the platform structure and slidab-ly engaging the guides, and means for simultaneously operating the pistons to either raise or lower the platform from one fioor to the other.

3. 'Ihe combination with a structure having a lower oor, an upper floor, and a shaft extending between said floors and through the upper floor, of a pair of laterally spaced upright casings in the shaft between said floors and rigidly secured relative to the structure, a piston in each casing, a cross-head mounted on the upper ends of the pistons above the casings, a platform, slings suspending the platform from the cross-'head between the pistons for travel between the casings and above the same, a pair of guides extending parallel to the axes of the casings and the pistons and rigidly secured one to each of the casings., shoes carried by the cross-head and the platform structure and slidably engaging the guides, and means for simultaneously operating the pistons to either raise or lower the platform from one floor to the other.

4. In a device of the kind described, a self contained unit comprising an upright casing, a plurality of brackets rigidly secured to the casing and having means for securing the same to a to the brackets parallel to the axis of the casing.

CARL s. LAGERQUIST. FRANK w. LAGERQUIST. 

